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The clustering of alumina inclusions

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Abstract

Factors influencing the tendency of alumina particles in steel to agglomerate and form large clusters during deoxidation and solidification have been investigated by deoxidizing melts of Fe-10 pct Ni alloys with 0.1 pct aluminum under an inert atmosphere. Clusters of alumina inclusions are formed when the melt is stirred by either inductive or mechanical means. Nearly all of the inclusions are found in the clusters if the stirring time is long enough or at moderate stirring rates. Inclusions within the clusters increase in size with time while the size of inclusions in nonclustered regions remains essentially constant. The oxygen content of an ingot solidified soon after deoxidation corresponds well with that calculated from the oxygen content of the charged materials. After most inclusions have migrated to the clusters, the oxygen content in nonclustered regions is found to be as low as 2 ppm.

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Authors and Affiliations

  1. Utah Refinery, Kennecott Copper Corp., 84111, Salt Lake City, UT

    T. B. Braun (Technical Superintendent)

  2. Massachusetts Institute of Technology, 02139, Cambridge, MA

    J. F. Elliott (Fellow of TMS and ASM,Professor of Metallurgy)

  3. Massachusetts Institute of Technology, 02139, Cambridge, MA

    M. C Flemings (Ford Professor of Engineering)

Authors
  1. T. B. Braun
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  2. J. F. Elliott
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  3. M. C Flemings
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Formerly Graduate Student, M.I.T..

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Braun, T.B., Elliott, J.F. & Flemings, M.C. The clustering of alumina inclusions. Metall Trans B 10, 171–184 (1979). https://doi.org/10.1007/BF02652461

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  • DOI: https://doi.org/10.1007/BF02652461

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